Adjustable length ski pole

ABSTRACT

An improved adjustable length ski pole which can be quickly and securely adjusted. A preferred embodiment of the pole includes two telescoping pole sections. The upper pole section includes a tree element having a series of spaced slots. The lower pole section includes a locking unit having a resiliently biased engagement member that locks into engagement with on of the spaced slots. The user simply plants the pole into a surface, twists the upper handle to rotate the upper pole section relative to the lower pole section causing the engagement member to disengage from the slot and slides the upper pole section relative to the lower pole section to the desired height. The user then allows the upper pole section to rotate back to it&#39;s original position causing the engagement member to lock back into the nearest slot.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] This invention relates to the field of ski poles and particularly to the field of adjustable length ski poles.

[0003] 2. Statement of the Problem: Ski poles are a necessary element for proper skiing. These poles have also come to be used in a variety of other applications other than skiing, such as roller blading, roller skating, snow-shoeing and trekking. In fact, these poles are essentially any pole held in the user's hands to propel the user, to balance, and to assist in turning both on snow and ice and on dryland.

[0004] The appropriate length of the ski poles is a critical factor for performance and enjoyment of skiing. This is true not only in alpine skiing but in cross-country and back-country skiing as well. This also true in the other alternative uses discussed above including roller blading, roller skating, roller skiing, snow-shoeing trekking, trail running, and other uses. Most ski poles are fixed in length and are non-adjustable. The problems with fixed-length ski poles are numerous.

[0005] One particular problem with using fixed length ski poles in skiing and in other uses is the inability to adjust to varying terrain and snow conditions. Different conditions can require different lengths of ski poles to enhance the performance of the user. For instance, a skier may prefer shorter ski poles with steeper terrain, longer ski poles with flatter terrain as well as differing ski pole lengths depending on the condition of the snow pack. Also, the aggressiveness of the skier in a particular condition may change the choice of the length of ski poles.

[0006] Another problem with fixed length ski poles is the necessity to have different ski poles for differing types of skiing. For instance, alpine or downhill skiing requires a certain length of ski pole for a particular skier. Classical or diagonal cross-country skiing requires a longer ski pole for that same skier to provide the push-off for momentum. Skate-skiing cross-country normally requires an even longer ski pole for that skier to be efficient. Skiing in back-country terrain may require several lengths of ski poles to be truly effective. Additionally, because of the differing terrain encountered during back-country skiing, it is often desirable to be able change the length of the ski poles on the fly. A longer ski pole is preferable on uphill terrain for power while a shorter ski pole is desirable on downhill terrain for balance. An individual skier may be required to inventory a variety of ski poles depending on the type of skiing and on the conditions to be skied.

[0007] Another problem arising with fixed length ski poles is the use by different people. Most ski poles are sized to a particular person according to the height of that person. Thus, a particular set of ski poles will not be easily usable by another person of differing height. This can be an expensive problem for groups of individuals who may want to interchange ski equipment. This is particularly a problem with families with children requiring new ski poles periodically as they grow.

[0008] This is also a problem with rental ski equipment. Ski shops are required to maintain a large selection of different lengths of ski poles. Maintenance of this large inventory of different length ski poles is a significant expense in terms of cost and space.

[0009] Other dryland or non-ski uses for poles encounter similar problems. For instance, in roller blading or roller skating, an adjustable ski pole allows the user to use a longer pole on the ascent but collapse the pole to a shorter, more manageable length on the descent. This also holds true for trail running and trekking. Another popular sport is snow-shoeing. Snow shoeing often requires change in elevation and thus change in ski pole length to be efficient.

[0010] Thus, the use of fixed-length ski poles is a significant problem in skiing and other related uses. A number of attempts to solve this problem have been attempted in the past. These prior attempts to solve this problem have not met with critical success.

[0011] One prior attempt to solve this problem is an adjustable length ski pole having a push-button mechanism. A push-button is incorporated in the ski pole handle which releases a “detent” mechanism to allow telescoping ski pole sections to adjust in relative length. This mechanism is a relatively complicated device with numerous parts. These parts add weight to the ski pole which is a critical feature and tend to rattle within the ski pole. In addition, the mechanism is difficult to properly adjust, particularly when skiing under difficult conditions and on the fly adjustments. This particular attempt has not met with success on the market.

[0012] Another prior attempt to solve this problem is an adjustable length ski pole having a clamping wedge to secure telescoping ski pole sections. The clamping wedge is rotated to loosen the frictional clamping force holding the telescoping pole sections together. The ski pole sections can then telescope relative to one another to set the length of the ski poles. This type of device has a number of inherent problems. The clamping is non-positive which allows slippage of the ski pole sections. This slippage thus requires frequent readjustment to overcome. Additionally, the non-positive clamping causes a problem with keeping both ski poles at the same length.

[0013] Another problem arising with this type of adjustable length ski pole is the necessity of symmetrical snow baskets. Symmetrical snow baskets are required with this type of ski pole since the pole sections are rotated during the adjustment of the length. However, asymmetrical snow baskets are preferred, especially with cross-country skiing. Asymmetrical snow baskets provide a significantly greater push-off during poling. The use of asymmetrical snow baskets are essentially foreclosed with these prior adjustable length ski poles.

[0014] This type of clamping also requires a two-handed adjustment to overcome the frictional clamping force. This requires stopping the activity to adjust. The force to overcome the clamp can be significant, particularly for children and people with small hands. The clamping wedge is also affected by icing and snow on and in the joint on the clamping wedge. These types of adjustable length ski poles also tend to break easily at the joint under the pressures and impacts of skiing.

[0015] Thus, a need exists for an adjustable length ski pole which will solve these and other problems. These problems exist not only in ski poles but in other support poles or shafts. For instance, camera tripods or support poles are often used to support camera equipment. These tripods or support poles are often adjusted depending on the terrain and/or subject matter being photographed. The prior attempts to provide an adjustable length support structure are cumbersome and time-consuming to adjust. This is also true with crutches. Crutches are typically adjustable in length since the uses are normally only temporary. Another use for adjustable length poles are in tents and awnings. These are normally or collapsible to allow ease in packing and transport. Setting up these structures is often difficult because of the need to adjust the poles to the required length and other uses involving cylindrical shafts.

[0016] The present invention provides a solution to these problems by providing a mechanism with a simple innovative one handed operation. The present invention enables use of the adjustable length poles in a wide variety of applications and users.

SUMMARY OF THE INVENTION

[0017] The present invention provides an improved adjustable length ski pole that can be quickly and securely adjusted. The adjustment and locking mechanism is lightweight, strong and provides positive locking. In a preferred embodiment of the present invention, the adjustable length ski pole uses a resilient spring mechanism for positive engagement of the locking mechanism.

[0018] The pole of this preferred embodiment is capable of being adjusted with one hand, and even while moving. The user merely plants the pole onto the ground surface and twists the upper handle. This causes relative movement of the two pole sections to disengage the locking mechanism and allow the pole sections to be moved relative to one another for length adjustment.

[0019] The pole of this embodiment can be collapsed for storage and transport. The pole can be quickly elongated for use and adjustment.

[0020] An end cap is provided to the pole of this embodiment to minimize contamination of the locking mechanism and the inner portions of the ski pole. The end cap also prevents the sections of the pole from accidentally separating.

[0021] In the preferred embodiment of this pole uses two telescoping pole sections. A metallic or plastic tree element is secured to the upper pole section. This tree element includes a series of spaced notches or slots. The locking mechanism is secured to the lower pole section. This locking mechanism includes a resiliently biased engagement member that engages in the notches of the tree element in the upper pole section. Twisting of the upper pole section relative to the lower pole section causes the tree element of the upper section to move away from the engagement member. Once the engagement member is disengaged from the notch, the upper pole section and the lower pole section can be moved relative to one another to adjust the length of the pole.

[0022] Another embodiment of the present invention uses an elastomer body to provide torsional force to cause positive engagement of the locking mechanism. The adjustable length ski pole of this preferred embodiment includes two telescoping ski pole sections. A metallic or plastic sleeve is inserted between these telescopic shafts and affixed within the larger diameter shaft. Two diametrically opposed vertical slots are formed in the sleeve in the upper ski pole section. Pairs of opposing spaced curved slots are formed in the sides of the upper ski pole sleeve section opening into the vertical slots. An elastomer body is secured to the lower ski pole section by a lower pin which extends radially outward from the lower ski pole section. A portion of the elastomer body extends above the upper end of the lower ski pole section. An upper pin extends radially through this upper portion of the elastomer body offset at approximately a ninety degree angle from the lower pin.

[0023] The upper pin engages within the vertically-extending slots in the upper ski pole section. The lower pin engages into one of the pairs of spaced curved slots to hold the lower ski pole section in the upper ski pole section. The elastomer body is twisted by the engagement of the upper pin in the vertically extending slots and the engagement of the offset lower pin the curved slots. The twisted elastomer body creates a torsional force to force the lower pin to remain in engagement with the curved slots.

[0024] The length of the ski pole is easily and quickly adjusted. The ski pole sections are rotated so that the lower ski pole section rotates counter-clockwise a small turn (about a quarter turn) relative to the upper ski pole section. This rotation causes the lower pin to move out of engagement with the pair of curved slots it was previously engaged in and align within the vertically-extending slots. The ski pole sections can then move axially relative to one another until the appropriate length of the ski pole is selected. The ski pole sections are then released relative to one another. Upon release, the torsional force from the pre-twisted and torsionally-loaded elastomer body forces the lower pin into engagement with the nearest pair of curved slots.

[0025] Thus, the problem of adjustable length ski poles has been addressed. The length of the ski pole can be quickly, easily and positively adjusted. The shape of the curved slots provides a secure lock. As weight is applied the locking force becomes greater under the increased torsional loading. The positive engagement of the lower pin into the curved slots held by the torsional forces from the twisted elastomer body prevents accidental slipping and misalignment. The snow basket is held in alignment with the ski pole grip since there is no relative rotation of the ski pole sections except for release for adjustment. The ski pole sections always return to the same alignment. There are no moving parts or complicated mechanisms to add weight, rattles and complexity to the ski pole. Most importantly, the ski pole length can be adjusted very quickly and easily according to the existing situation and/or conditions.

[0026] In a further preferred embodiment of the present invention, there are additional features provided for absorbing the shock of pole plants during skiing and from impact of collisions or falls. The lower pole section includes opposing axial slots in which the lower pin is allowed limited movement. Thus, when the ski pole is planted into the snow or during a fall or collision, the upper ski pole section may move relative to the lower ski pole section with the elastomer body absorbing the energy of the impact. The ski pole sections are returned to their original positions relative to one another after the impact has lessened. This reduces the fatigue from the impact of pole planting as well as reducing the occurrence of injuries from falls and/or collisions. Also, snow conditions and terrain frequently vary within a single run. The use of shock absorption during pole planting provides a more consistent rhythm in the changing conditions. An additional soft elastomer body can also be mounted in the lower ski pole section adjacent the first elastomer body in its neutral position. The second elastomer body absorbs the impact from the first elastomer body to add further dampening capability and energy absorption to the ski pole.

[0027] The present invention is also applicable to other adjustable poles, shafts or elongated objects besides ski poles. For instance, the present invention relevant to the torsional locking mechanism has applicability to support structures such as camera supports, camera tripods, tent and awning poles, crutches, and many other elongated objects in which adjustable or collapsible lengths are desirable features. Further, there are applications wherein a series of telescoping or collapsible length elongated objects are used. The present use of the torsional locking mechanism is suitable for such uses as well.

[0028] The present invention is further described in the following detailed description of a preferred embodiment and in the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0029]FIG. 1 shows a perspective view of the assembled ski pole of a preferred embodiment of the present invention.

[0030]FIG. 2 shows a perspective view of the ski pole of FIG. 1 in an adjusted position.

[0031]FIG. 3 shows a perspective view of the ski pole of FIG. 1 in a fully compact position.

[0032]FIG. 4 shows an exploded view of the tree element and locking mechanism of a preferred embodiment of the present invention.

[0033]FIG. 5 shows a partially assembled view of the locking mechanism of the embodiment of FIG. 4.

[0034]FIG. 6 shows a see-through view of the embodiment of FIG. 4.

[0035]FIG. 7 shows another see-through view of the embodiment of FIG. 4 with an end cap.

[0036]FIG. 8 shows the tree elements of another embodiment of the present invention.

[0037]FIG. 9 shows the tree elements of FIG. 8 mounted into the upper ski pole section.

[0038]FIG. 10 shows the elastomer body of the embodiment of FIG. 8.

[0039]FIG. 11 shows lower ski pole section of the embodiment of FIG. 8.

[0040]FIG. 12 shows a breakaway view of the assembled ski pole of the embodiment of FIG. 8.

[0041]FIG. 13 shows a cutaway view of the ski pole in an adjusted position.

[0042]FIG. 14 shows a cutaway view of the ski pole during adjustment.

[0043]FIG. 15 shows a second preferred embodiment of the present invention with a shock absorber element.

[0044]FIG. 16 shows a cut-away view of the embodiment of FIG. 15.

[0045]FIG. 17 shows a third preferred embodiment of the present invention.

[0046]FIG. 18 shows a fourth preferred embodiment of the present invention.

[0047]FIG. 19 shows a fabricated tree element before shaping.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

[0048] The present invention provides an adjustable length pole that can be quickly and securely adjusted. A preferred embodiment of the present invention is disclosed in FIGS. 1-8. This particular embodiment is described as an adjustable ski pole. It is to be expressly understood that this description of a preferred embodiment is intended for explanatory purposes only and is not meant to limit the scope of the present inventive concept. Other embodiments and variations are considered to be within the claimed invention. For example and without limitation, other embodiments include trekking poles, hiking poles, snow shoeing poles, and even for use as adjustable structural poles for tents, awnings, and other structures.

[0049] A preferred embodiment of the present invention is illustrated in FIG. 1. In this descriptive embodiment, ski pole 10 includes ski pole grip 12 that can be of any desired configuration. Ski pole 10 also includes snow basket 14 and ski pole tip 16. Ski pole grip 12, snow basket 14 and ski pole tip 16 do not form part of the present invention and can be of any known configuration.

[0050] The ski pole of this preferred embodiment provides numerous advantages over the prior fixed length and adjustable ski poles. The ski pole can be quickly adjusted without removing the poles from the wrist of the skier. The ski pole is positively adjusted with no slippage of the adjustment. It is easier to return the ski pole to a desired length. The basket on the lower end of the ski pole will always be oriented in the same direction. This is important for eccentric snow baskets. The present invention also provides many other advantages that will become evident from the ensuing detailed description of a preferred embodiment.

[0051] In the preferred embodiment of the present invention, ski pole 10 further includes ski pole section 20 and ski pole section 30. Ski pole 10 can include multiple sections, including three or more if desired to provide even more adjustability. Ski pole section 30 has an outer radius less than the inner radius of ski pole section 20 to allow ski pole section 30 to telescope within pole section 20. Also shown in FIG. 1 is tapered lip 40 for preventing snow, ice and other debris from engaging between pole section 20 and pole section 30.

[0052] First Embodiment

[0053] The adjustment mechanism for a first preferred embodiment of the present invention is illustrated in FIGS. 4-7. The adjustment mechanism 100 includes a tree element 110 that can be formed of hard plastic materials, anodized aluminum or other materials. The outer surface of tree element 110 is curved to approximately the same radius as the inner diametrical surface 22 of upper pole section 20 and includes two attachment posts 112, 114. Tree element 110 is inserted into the inner section of the upper pole section 20 until attachment posts 112, 114 into holes 24, 26 of upper pole section.

[0054] The ends 116, 118 of tree element are tapered between first edge 120 and second edge 122. Notches 124-132 are formed in the first edge 118 of tree element spaced from one another. The spacing is determined according the degree of adjustment for the ski pole. A smaller notch 134 is formed in the lower portion of second edge 122.

[0055] The adjustment mechanism 100 also includes locking unit 140 that engages with tree element 110 and disengages for adjustment of the ski pole. Locking unit 140 has a central aperture 142 extending through it. Slot 144 in the upper portion of locking unit 140 extends into the central aperture 142 and has a width discussed below. Curved engagement tooth 146 extends outwardly from the upper portion of locking unit 140. The height of engagement tooth 146 is equal to or less than the height of the notches 124-132. The outer diameter of engagement tooth and locking unit 140 is approximately equal or less than the inner diameter of upper ski pole section 20. The locking unit 140 also includes a lower portion 148 having a reduced diametrical portion having a diameter slightly less than the inner diameter 32 of lower ski pole section 30. Groove 150 is formed in the locking unit 140 between lower portion 148 and the upper portion of locking unit.

[0056] The locking unit 140 also includes O-ring 152 that engages into groove 150 on locking unit 140. The locking unit 140 also includes spring 154 that has a lower U shape terminating with a radially extending end portion 156. The spring 154 also includes an upper end 158 extending radially in the same direction as end portion 156.

[0057] The locking unit 140 includes an inner unit 160. Inner unit 160 includes a lower reduced portion 162 that retains the lower portion of spring 154. The inner unit also includes an upper slot 164 that retains the upper end 158 of the spring 154. Tooth 164 extends outwardly from the upper portion of inner unit 160. The width of tooth 164 of the inner unit and the width of notch 144 of the locking unit 150 is such to allow the tooth 164 to move within the notch 144 a distance adequate to allow tooth 146 to disengage from each of the notches 124-132 of the tree element 110.

[0058] The locking unit 140 is assembled by securing the spring 154 about the inner unit 160 and inserting the inner unit 160 into the central aperture 142 of the locking unit 140. Tooth 166 engages into the notch 144 of the locking unit 140. O-ring 152 is secured into groove 150 on the locking unit 140. The assembled locking unit 140 is then inserted into inner diameter 32 of the ski pole 30. O-ring 152 prevents the interior of the pole from being contaminated as well as frictionally securing the locking unit to the ski pole section 30.

[0059] The curved tooth 146 engages into one of notches 124-132 of tree element 110, as shown in FIG. 5. The assembled adjustment mechanism 100 is inserted into upper pole section 20 until engagement posts 112, 114 engage into holes 24, 26 of upper pole section 20. Alternatively, the tree element 110 is previously assembled into upper ski pole section 20. The assembled locking unit 140 is inserted into the upper ski pole section by allowing the curved tooth 146 to ride up the lower tapered section 116 of the tree element 110.

[0060] The spring 154 resilient biases the tooth 166 of the inner unit 160 against the wall of the notch 144 to force the curved tooth 146 into one of the notches 124-132. In use, the person using the pole simply twists the upper ski pole section 120 in a clockwise direction relative to the lower section 30 that is engaged in a surface. The second edge 122 of tree element 110 engages the tooth 166 to force the tooth against the bias of the spring 154 clockwise into the notch 144. This disengages the curved tooth 146 from the notch (124-132). The upper pole section 20 can then slide relative to the lower pole section 30 upward or downward to adjust the height of the pole 10.

[0061] This unique adjustment mechanism 100 allows the height of the pole 10 to be adjusted on the fly, with only one hand. It is not necessary to unclamp the pole sections or to use two hands to perform the adjustment.

[0062] In another preferred embodiment, the pole adjustment mechanism includes an end cap 170, as shown in FIG. 7. End cap 170 includes tapered end portion 172 and reduced diametrical portion 174. The reduced diametrical portion and end portion 172 create an abutment surface 176 for engagement with the end of upper pole section 20. An extended member 178 terminates in a radial detent 180 that engages in notch 134 of tree element 110. The end cap 170 is formed from a resilient plastic or other material. The radial detent 180, during assembly, slides up the tapered portion 116 of the tree element 110 until it reaches the slot 134 where it snaps into place. The end cap 170 slides with upper pole section 20 over lower pole section to minimize contamination of the internal ski pole and adjustment mechanism 100. The end cap 170 also prevents the locking unit 140 from accidentally leaving the upper pole section 20 that would cause the pole sections to separate. The end cap 170 must be removed from the upper pole section 20 first before the locking unit can be removed from the upper pole section.

[0063] Second Embodiment

[0064] Another embodiment of the adjustable length ski pole mechanism includes opposing tree elements 200 and 250, shown in FIG. 8, for mounting within ski pole section 20. Tree elements 200, 250 are identically formed from a hard anodized aluminum alloy to provide wear resistance and strength with a Teflon coating to minimize friction with ski pole section 30. Other materials can be used as well as known in the art to provide these qualities. For instance, nylon, Delrin®, stainless steel and other materials could be used as well.

[0065] Tree elements 200, 250 have an outer radius R₁ substantially the same as the inner radius of ski pole section 20 and an inner radius R₂ slightly larger than the outer radius of ski pole section 30. Each of tree elements 200, 250 include leading edges 202, 252 and trailing edges 204, 254, respectively. Tree elements 200, 250 each have a plurality of upwardly curved slots 210-224, 260-274, formed in leading edges 202, 252, respectively. The number and spacing of these curved slots can be selected to give the desired adjustable range. Lower gates 226, 276 are formed in tree elements 200, 250 adjacent lowermost slot 224, 274. Notches 238, 278 are formed in substantially flat extended surfaces 240, 280 in tree elements 200, 250 spaced from lower gates 226, 276. Recessed surfaces 242, 282 are formed in opposing surfaces of each of tree elements to allow for extended surfaces 240, 280. Guide surfaces 244, 284 angle downward towards lower ends 246, 286 of tree elements 200, 250. Tapered lips 248, 288 on lower ends 249, 289 of tree elements 200, 250 form seal 40 shown in FIG. 1.

[0066] Lower gates 226, 276 (as discussed in greater detail below) provide a locking mechanism to prevent ski pole sections 20 and 30 from accidentally releasing. Ski pole sections 20 and 30, however, may be disengaged if desired with an additional twisting release as described below.

[0067] Tree elements 200, 250 are secured within lower end 22 of ski pole section 20, as shown in FIGS. 9 and 13, by double sided adhesive tape. The method of assembling these elements is described in detail below. Other methods of securing the tree elements could be used as well. Opposing slots 500, 510 are formed within ski pole section 20 by spaces between tree elements 200, 250. Curved slots 210-224, 260-274 are diametrically opposed from one another to form pairs of slots and are directly adjacent trailing edges 204, 254 across slots 500, 510.

[0068] Elastomer locking unit 300 is shown in FIG. 10. Elastomer locking unit 300 includes cylindrical body 310 formed of a resilient elastomer such as polystyrene or other resilient materials. Preferably, elastomer locking unit is flexible down to minus forty (40) degrees Farenheit with a hardness of 75-95 Shore A. It is to be expressly understood that the present invention is not to be limited to this particular material but includes other suitable materials having a torsional resilience. Further, the material may be chosen according to the desired torsional force and/or shock absorption desired, as further described below. Elastomer locking unit 300 can also be fluted or ribbed.

[0069] In the present embodiment, elastomer locking unit 300 is approximately one and one-half inches long and has a diameter slightly less than the inner diameter of ski pole section 30. Radial holes 312, 314 are drilled in elastomer cylindrical body 310 spaced from upper end 316 and lower end 318 of body 310. Radial holes 312, 314 are offset about ninety degrees (90°) from one another. This angle can be varied to provide varied torsional resistance and to mesh with different slot patterns in the trees. Brass pins 320, 322 are inserted into radial holes 312, 314 of body 310. Pins 320, 322 have a length L₁ greater than the outer diameter of ski pole section 30 but less than the inner diameter of ski pole section 20.

[0070] Upper end 400 of ski pole section 30, shown in FIG. 11, includes radial hole 402 spaced therefrom. Elastomer body 310 is inserted into upper end 400 of ski pole section 30. Elastomer body is secured therein by pin 322 inserted through radial hole 402 of ski pole section 30 and through radial hole 314 of elastomer body 310. Pin 320 rests on upper end 400 of ski pole section 30.

[0071] Assembly

[0072] Upper end 400 of lower ski pole section 30 is inserted into lower end of upper section 20 as shown in FIG. 9. Pin 320 is inserted into slots 500, 510 and engages guide surfaces 244, 284 of tree elements 200, 250 in ski pole section 20. The engagement of pin 320 with angled guide surfaces 244, 284 cause elastomer body 310 to twist as ski pole section 30 telescopes within ski pole section 20. Pin 320 is guided onto flat extended surfaces 240, 280 until it engages in notches 238, 278. This engagement allows the opportunity to ensure that lower pin 322 extending through ski pole section 30 to engage in slots 500, 510 to prevent misalignment. Once lower pin 322 has engaged in slots 500, 510, ski pole sections 20, 30 are further telescoped together until upper pin 320 and lower pin 322 are moved past lower gates 226, 276. Lower gates 226, 276 prevent ski pole sections 20, 30 from accidentally separating during use or adjustment. Similarly, upper gates may be formed on the upper end of tree elements 200, 250 to prevent movement of upper pin beyond a predetermined distance.

[0073] Ski pole sections 20, 30 are further telescoped together until upper pin 320 engages into one of the pairs of slots 210-224, 260-274. The torsional force from twisted elastomer body 310 forces upper pin 320 into engagement into the slots and retains pin 320 into that engagement. Lower pin 322 is held from releasing this force by engagement with trailing edges 204, 254 in slots 500, 510. At this point, ski pole 10 is fully assembled.

[0074] Adjustment

[0075] The length of ski pole 10 is easily and quickly adjusted. Ski pole 10 is planted in the snow for one-handed adjustment or ski pole sections 20, 30 are each grasped for two-handed adjustment. Ski pole grip 12 or ski pole section 20 is rotated so that lower ski pole section 30 rotates counter-clockwise a small turn (about a quarter turn) relative to upper ski pole section 20. This rotation causes lower pin 322 to move out of engagement with the pair of curved slots it was previously engaged in and align within slots 500, 510. Ski pole sections 20, 30 can then move axially relative to one another until the appropriate length of ski pole 10 is selected. Ski pole sections 20, 30 are then released relative to one another. The torsional force from twisted elastomer body 310 then forces lower pin 322 into engagement with the nearest pair of curved slots 210-224, 260-274. The shape of curved slots 210-224, 260-274 provide increased locking action as weight is applied to the ski pole. As weight is applied to the ski pole, the pressure on elastomer body 310 actually increases, thus increasing the secure locking of the ski pole sections to one another.

[0076] Thus, the problem of adjustable length ski poles has been addressed. The length of ski pole 10 can be quickly, easily and positively adjusted. The positive engagement of lower pin 322 into slots 210-224, 260-274 held by the torsional forces from twisted elastomer body 310 prevents accidental slipping and misalignment. Snow basket 14 is held in alignment with ski pole grip 12 since there is no relative rotation of ski pole sections 20, 30 except for release for adjustment. The ski pole sections always return to the same alignment. There are no moving parts or complicated mechanisms to add weight, rattles, complexity or to wear out. Most importantly, the ski pole length can be adjusted very quickly and easily according to the existing situation and/or conditions. The ski pole can even be adjusted with one hand while the other hand stays on the grip.

[0077] Shock Absorbing Embodiment

[0078] A further preferred embodiment of the present invention is illustrated in FIGS. 15 and 16. This embodiment is substantially identical to the above described embodiment with the additional features provided for absorbing the shock of pole plants during skiing and from impact of collisions or falls. As shown in FIG. 15, lower pole section includes opposing radial slots 600, 610 in lieu of radial hole 402. The remaining structure is identical for this embodiment. Lower pin 322 extends through radial slots 600, 610 for limited longitudinal movement within radial slots relative to lower pole section 30. Thus, when ski pole 10 is planted into the snow or during a fall or collision, upper ski pole section 20 may move relative to lower ski pole 30 with elastomer body 310 absorbing the energy of the impact. The ski pole sections are returned to their original positions relative to one another after the impact has lessened. This reduces the fatigue from the impact of pole planting as well as reducing the occurrence of injuries from falls and/or collisions. Also, snow conditions and terrain frequently vary within a single run. The use of shock absorption during pole planting provides a more consistent rhythm in the changing conditions.

[0079] A further embodiment is also shown in FIG. 17. Soft elastomer body 630 is mounted in lower ski pole section 30 adjacent elastomer body 310 in its neutral position. Elastomer body 630 absorbs the impact from elastomer body 310 during impact to add further dampening capability and energy absorption to ski pole 10.

[0080] Spring leaf 640 can also be used to add further shock absorption. Spring leaf 640 expands during compression to grip against the sides of the pole section. The resilient action of spring leaf 640 provides additional dampening capability and energy absorption.

[0081] Additional Ski Pole Embodiment

[0082] Another preferred embodiment of the present invention is considered as well. The upper pole section is substantially identical to the above described embodiment. An elastomer body now includes a middle radial hole offset ninety degrees (90°) or any other desired angle from an upper hole and lower hole which are vertically aligned with one another. Radially opposed slots are formed near the upper end of lower ski pole section. A radial hole is formed in lower ski pole section offset ninety degrees (90°) from radial slots. A lower pin is inserted through one of the radial holes and elastomer body lower hole to secure the elastomer body in the lower ski pole section. A middle pin is inserted through the radial slots and the middle radial hole of elastomer body. An upper pin is inserted through the upper hole of the elastomer body.

[0083] The assembly of this embodiment is similar to the above described assembly. The middle pin now engages within a selected pair of curved slots in the tree elements. The middle pin can also move within the radial slots to allow relative damped movement between the ski pole to absorb impact as described above. A dual density elastomer can be used as well. This elastomer can have a softer portion on the bottom with increasing stiffness.

[0084] In another ski pole embodiment, not shown, a torsion spring is used instead of the elastomer body. The operation is similar to described above. The torsion spring is secured at one end from axial or radial movement. The spring is pre-loaded to force a pin to which it is secured into a pair of the curved slots described above. Relative twisting between the ski pole sections removes the pin from the slots to allow axial adjustment of the length of the ski pole.

[0085] Other ski pole embodiments include the use of sealer cap over the area where ski pole sections 20, 30 join to prevent snow, ice and other debris from fouling the telescoping action of the ski pole sections.

[0086] Manufacture

[0087] In the preferred embodiment discussed above, the adjustable length ski pole mechanism includes separable tree elements 200 and 250. Tree elements are in manufactured of anodized aluminum alloys, nylon, Delrin®, stainless steel or other suitable materials. The tree elements, as shown in FIG. 19 are stamped in a flat plane. The tree elements are then shaped to the appropriate radius. In one preferred assembly method, trees 200, 250 are mounted on an expandable mandrel. Double sided adhesive tape or a bonding agent is applied to the outer surfaces of trees 200 and 250. The trees on the expandable mandrel are inserted into ski pole section 20. Once the trees are in the appropriate position within ski pole section 20, the mandrel is expanded to secure the trees within ski pole section 20. Other alternative methods of securing the trees within ski pole section 20 cold be used as well, such as welding and the like.

[0088] In another embodiment, ski pole section 20 includes a molded shaft having the curved slots and pathways formed as one complete unit. Thus, the trees would not need to be separate assembled elements. In another embodiment, shown in FIG. 18, single tree element 1400 is formed of molded plastic, or other materials as discussed above. Tree element 1400, as shown in FIG. 18 is thicker in cross-section and secured within ski pole section 20 as discussed above. Anti-friction pad 1410 is secured on the opposing inner surface of ski pole section 20. Lower ski pole section 30 adjusts in a manner as discussed above. A standard tree element, as discussed above, could be uses as well with a thicker anti-friction pad.

[0089] Additional Uses

[0090] The present invention provides an improvement over the prior fixed length and adjustable ski poles. The ski pole can be quickly adjusted from an extended position, as shown in FIG. 1, to a variety of intermediate positions, as shown in FIG. 2, to a compact position as shown in FIG. 3. The pole sections can be easily separated for cleaning or storage. The ski pole can be quickly adjusted without removing from the wrist of the user. Additionally, the ski pole can be positively adjusted without worry of slippage of the pole sections. The ski pole can be repeatedly adjusted to predetermined positions. The basket on the ski pole will always be oriented in the proper position after adjustment. These and other features provide an improved adjustable ski pole.

[0091] The present invention is also applicable to other adjustable poles, shafts or elongated objects besides ski poles. For instance, the present invention is relevant to the torsional locking mechanism has applicability to support structures such as camera supports, camera tripods, tent and awning poles, crutches, and many other elongated objects in which adjustable or collapsible lengths are desirable features. Further, there are applications wherein a series of telescoping or collapsible length elongated objects are used. The present use of the torsional locking mechanism is suitable for such uses as well.

[0092] While specific embodiments of the present invention have been disclosed, it is expected that those skilled in the art can and will design alternate embodiments of this invention that fall within the scope of the claimed invention. The descriptions of preferred embodiments is solely intended for descriptive purposes and is not meant to limit the scope of the inventive concept. 

We claim:
 1. An adjustable length ski pole, said adjustable length ski pole comprising: a first pole section; a second pole section axially slidable relative to said first pole section; a radially extending member affixed to said first pole section; a plurality of slots within said second pole section; a resilient mechanism forcing said radially extending member into a selected one of said plurality of slots to prevent said sliding movement of said second pole section relative to said first pole section wherein rotation of said first pole section relative to said second pole section releases the force from said resilient mechanism against said radially extending member to move said radially extending member from said selected one of said plurality of slots to allow sliding movement of said second pole section relative to said first pole section for adjustment in the length of said ski pole.
 2. The adjustable length ski pole of claim 1 wherein said resilient mechanism for forcing said radially extending member into a selected one of said plurality of slots includes: a spring member.
 3. The adjustable length ski pole of claim 2 wherein said resilient mechanism includes: a torsional spring.
 4. The adjustable length ski pole of claim 1 wherein said resilient mechanism includes: an elastomer member
 5. The adjustable length ski pole of claim 1 wherein said radially extending member includes: a first member having a central axially extending aperture; a second member engaged in said centrally axially extending aperture; an engagement member extending radially from second member for engagement in one of said slots; and a spring biasing said second member relative to said first member.
 6. The adjustable length ski pole of claim 1 wherein said resilient mechanism forcing said radially extending member into a selected on of said plurality of slots includes: an elastomer cylinder affixed on one end to said first pole section; and said radially extending member is affixed to a second end of said elastomer cylinder.
 7. The adjustable length ski pole of claim 1 wherein said plurality of slots include: curved slots to minimize accidental dislodgment of said radially extending member from said slots.
 8. The adjustable length ski pole of claim 1 wherein said adjustable length ski pole further comprises: an end cap for preventing accidental separation of said first pole section from said second pole section.
 9. The adjustable length ski pole of claim 1 wherein said adjustable ski pole further includes: a cam surface formed near the lowermost of said slots on said second pole section wherein an additional force is required to move said radially extending member past said cam surface to prevent accidental separation of said first pole section from said second pole section.
 10. The adjustable length ski pole of claim 1 wherein said adjustable length ski pole further comprises: an axial slot formed in said first pole section; an elastomer cylinder; a first radially extending member extending radially from one end of said elastomer cylinder and through said axial slot to secure said elastomer cylinder relative to said first pole section; a second radially extending member extending radially from a second end of said elastomer cylinder; and means securing said second pin to said second pole section wherein shocks are absorbed by movement of said elastomer cylinder relative to said first pole section.
 11. The adjustable length ski pole of claim 10 wherein said means for absorbing shock further include: additional elastomer cylinders for additional shock absorption.
 12. A method of adjusting the length of an adjustable length ski pole having two telescoping pole sections secured together by a resilient force locking an engagement member secured to a first one of the pole sections into slots formed in the second of the pole sections, said method comprising the steps of: rotating said first pole section relative to said pole section to release said resilient force to unlock said engagement member from a slot formed in said second pole section; axially moving said first pole section relative to said second pole section to select the desired length of said ski pole; and releasing said first pole section relative to said second pole section to allow said resilient force to lock said engagement member into the nearest adjacent slot formed in said second pole section.
 13. The method of claim 12 wherein said method of adjusting the length of an adjustable length ski pole further includes the steps of: preventing the accidental separation of said first pole section relative to said second pole section by providing an end cap; and allowing the separation of said first pole section relative to said second pole section by removing said end cap.
 14. A process of creating an adjustable length ski pole, said process comprising the steps of: providing a first pole section having radially extending member affixed thereto; providing a second pole section axially slidable relative to said first pole section; providing a plurality of spaced slots within said second pole section; providing means for resiliently forcing said radially extending member into a selected one of said spaced slots to lock said first pole section from axial movement relative to said second pole section at a selected length; and providing means for releasing said resilient force from said means for resiliently forcing said radially extending member into a selected one of said spaced slots to allow axial movement of said first pole section relative to said second pole section to adjust the length of said ski pole.
 15. The process of claim 14 wherein said step of providing means for resiliently forcing said radially extending member into a selected one of said spaced slots to lock said first pole section from axial movement relative to said second pole section at a selected length includes a step for: providing a spring member to resiliently force said radially extending member into one of said spaced slots.
 16. The process of claim 14 wherein said step of providing means for resiliently forcing said radially extending member into a selected one of said spaced slots to lock said first pole section from axial movement relative to said second pole section at a selected length includes a step for: providing an elastomer member to resiliently force said radially extending member into one of said spaced slots.
 17. The process of claim 15 wherein said process further includes the steps of: providing an end cap to prevent accidental disengagement of said first pole section from said second pole section unless an additional force is provided to move said pin past said cam surface. 